Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 146
m the original drawing on SCALES 125 the scale, we find it occupies the position of cf; the distancebetween e, and g will then give the length of the measurementto the enlarged scale, i.e. in the proportion of 3 : 1. We proceedin the same manner with every measurement we wish to enlarge.Should we… … In Fig. 251 we have a series of measurements—ki. Ah, Ag,etc.—which we wish to enlarge, say in the proportion of 3 : 2. Draw the line AB any convenient length to suit size ofdrawing. From B draw BD perpendicular to AB. ProduceAB to C, and make BC equal to half of AB. With centre A,and radius AC,…
Geometrical drawing
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